If I am using this to fill wood gaps in wood that is not rotted should I still use wood hardener first? How likely is this epoxy to come loose?

The petrifier can be used to harden rotted wood. You can also remove a lot of the rotted wood if that is possible given the project parameters. If you are filling a large void it is good idea to use some screws to act as rebar for the putty. You install the screws below the surface of the repair and make sure to drive them into good material. Then spread the putty into the hold around the screws when dry the putty will have wrapped around the screws almost like you "screwed" the putty to the surface. Make sure the screws are below the finished surface will allow the putty to hide the screws.

the bottom of my sash is rotted, so how do I keep the epoxy in the hole

Tape over the bottom if you have access to the bottom, but if not try plugging the bottom of the hole with putty or glazing compound

How thick can this be built up? I have floor joist, hacked by plumber. I've sistered it up but also want to fill gouge 3"W and ~3" deep

This can likely do it, just make sure you buy enough of it. I filled a 1" x 1" gap with ease. I'd imagine 3" x 3" is doable. Good on you for sistering the floor joist.

Is this product ok to use on my porch floor where it gets lots of traffic?

If the rotted-out section is properly prepared (say, by removing all damaged wood and applying a couple of coats of wood petrifier to soak the adjacent area), then yes, the epoxy paste will be equally as strong as wood and should withstand traffic. Just filling in the rot hole without treating the edges where it binds will eventually result in the "plug" separating. Be sure to paint or eurathane, etc. the finished, sanded repair.

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Protective Coatings 16333 12 oz PC-Woody Epoxy Paste

Protective Coatings 16333 12 oz PC-Woody Epoxy Paste

Product ID: 255332845

Details

Brand
PC Products
Item form
Paste
Material
Epoxy Resin
Special features
High Tack Time
Specific uses for product
Repair

⏳30-40 min working time

💪Stronger than most wood after cure

🌡️Wide temp range 35-115°F application

AR$143622

Duties & taxes included

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Sold byAmazon ArgentinaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Fix it like a pro — stronger, smarter, and built to last!

EXTENDED WORK WINDOW - 30-40 minutes of working time lets you sculpt and adjust without rush
WEATHERPROOF WOOD SAVIOR - Resists UV, dry rot, mildew, fresh & salt water for lasting outdoor durability
NON TOXIC NON CONDUCTIVE - Safe to use indoors and outdoors once fully cured, no harmful residues
PRECISION MIX PERFECT FIX - Two-part epoxy with exact 1:1 ratio ensures flawless, drip-free application
PAINTABLE MACHINABLE FINISH - Cures to a surface you can sand, stain, or paint for seamless restoration

PC Products PC-Woody is a two-part, tan epoxy paste designed to replace missing or rotted wood in both indoor and outdoor settings. It offers a broad application temperature range (35-115°F) and cures to a wood-strong, weather-resistant finish that withstands UV, mildew, dry rot, and water exposure. With a 30-40 minute working time and a 1:1 mix ratio, it provides a high-tack, drip-resistant application that can be painted or machined after curing. Ideal for professional-grade wood repairs requiring durability and precision.

Specifications

ASIN	B000H5O7Y8
Brand	PC Products
Brand Name	PC Products
Color	Tan
Colour	Tan
Compatible Material	Wood
Container Type	Can
Customer Reviews	4.6 out of 5 stars 3,182 Reviews
Full Cure Time	1 Weeks
Global Trade Identification Number	00054983163337, 00549831633372
Included Components	Caulk & Sealants, Painting Supplies, tile-epoxy-adhesives
Item Form	Paste
Item Package Quantity	1
Item Type Name	Protective Coatings 16333 12 oz. PC-Woody Epoxy Paste
Item Weight	12 Ounces
Item form	Paste
Manufacturer	Protective Coatings
Material	Epoxy Resin
Material Type	Epoxy Resin
Model	16333
Number of Pieces	2
Other Special Features of the Product	High Tack, Extended Working Time, Weather Resistant, Versatile Post-Curing
Part Number	163337
Special features	High Tack, Extended Working Time, Weather Resistant, Versatile Post-Curing
Specific Uses For Product	Repair, Woodworking
Specific uses for product	Repair, Woodworking
UPC	054983163337 549831633372
Unit Count	354.88 Milliliters
Volume	12 Fluid Ounces
Water Resistance Level	Water Resistant

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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